Ortho-oxyazo dye.



UNITED ls'nrrns PATENT ()FFIGE.

KARL scH'IRMAoHEit; AND FRIEDRICH SCHMIDT, or HOCHST-ON-THE- MAIN. GERMANY, ASSIGNORS TO FARBWERKE, VORM. MEISTER,

" LUCIUS & BRfTNING, OF HflCHST-ON-THEMAIN, GERMANY, A COR- PORATION OF GERMANY.

oR'rHo-oxYAzo DYE.

Specification of Letters Patent.

Application filed August 4, 1905 Serial No. 272.629.

Ton/l lwim'nt it may concern.-

Be it known that we, KARL SGHIRMAOHER, Ph. 1)., and Fummucn Scninor, Ph. D., chemists, citizens of the Empire of Germany, residing at l'lochst-omthe-Main, Germany, have invented certain new and useful Improvements in the lvlanufacture of Ortho- Oxymonoazo Dyestuffs, of which the following is a specification.

' We have found that by combining the diazo compound of ortho-amidophenol with.

1 :8 :3 :G-dioxynaphthalenedisulfonic acid haser-Items I OH (1) (1) ()H OH (8) c..n. some (3) Example: 10.9 kilograms of ortho-amidophenol are diazotized with thirty kilograms of hydrochloric acid of about 20 Baum and 6.9 kilograms of nitrite and gradually introduced at ordinary temperature into an aqueous solution of thirty-eight kilograms of the disodium salt of chromotropic acid I l ll,(OH) (SO -,Na) thirty kilograms of finely-divided hydrate Patented July 17, 1906.

of lime having been stirred in. The formation of the dyestufl is complete after about eight hours. It may be acidified with hydrochloric acid and the dyestuil' salted out with common salt.

When dry, the dyestufl' is a reddish-grayblack powder soluble in 'water with a red color. On adding sodium carbonate the solution turns bluer. On adding dilute hydrochloric acid hardly any change is produced in the color. In concentrated sulfuric acid the dyestuff is soluble with a violet color. The

- dyeing in an acid-bath is fuchsia-red, while the dyeing as chrome-lake is blue. Bv reducing with tin and hydrochloric acid the dyestufl' is splitted into ortho-=i1nidophcnol and amidochromotropic acid.

Having now described our invention, what we claim is As a new product, the ortho-oxymonoazo dyestufi having a sodium salt the formula:

, 1 OH H ion 4 I) Q We I I (2)-N:N (2) cmII/ being a reddish-gray-black powder soluble in water With a red color which on adding sodium carbonate becomes bluer, while on adding dilute hydrochloric acid hardly any change is produced in'the color; the dyesturf reduced with tin and hydrochloric acid being decomposed into ortho amidophenol and amidochromotropic acid and dyeing wool in an acid -bath fuchsia-red; the dyeing as chrome-lake being blue.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

KARL SCHIRVACHER. FRIEDRICH SCHMIDT. Witnesses:

ALFRnnBRIsnoIs,- BERNHARD LYnscIIER. 

